1. What you can : 3 x String Trimmer Replacement Spool, 1 x cover, enough for using or replacement, working as practical tools.2. Compatible with for model: F016800569 / F016800385 spool line, which is compatible with ART 23SL and ART 26SL, do check the model carefully purchasing to make it's the right fitting you need.3. Work more efficiently: these replacement lines are easy to install and flexible to use, which can use centrifugal force and aerodynamics to ease the work of hand-winding spools, making you work more efficiently.4. Warm tip: strong centrifugal force and cutting fast during using, wear eye protection and long pants to avoid unnecessary injury.5. material: High-quality ABS spool & durable nylon thread, flexible and long service life.Material:ABS, nyloncolour:blackPackage Contents:3 * Spool line1 * Spool coverOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.